How to play Tango and read the grid like a conversation

The goal of the game

Fill every cell with one of two symbols — usually a sun or a moon — so that the whole grid satisfies the rules at the same time. Some cells begin already filled, and some neighbouring cells are connected by an = or a × clue.

A standard Tango board is 6×6. That means each row and each column ultimately contains three suns and three moons. You never need to calculate a numeric answer: the symbols are simply two states whose relationships you must track.

First technique: stop a third matching symbol

The easiest deductions come from the “no three in a row” rule. If two identical symbols touch, any cell immediately before or after that pair — when present — must be the opposite symbol.

Second technique: look for a symbol sandwich

When two matching symbols have exactly one empty cell between them, the middle cell must be the opposite symbol. A pattern such as moon–empty–moon cannot become three moons, so the gap is forced to be a sun.

Third technique: finish a balanced row or column

A 6×6 line can contain only three suns and three moons. As soon as a row or column already has three of one symbol, every remaining empty cell in that line must be the other symbol.

Use = and × as chains, not isolated clues

Relationship clues become especially powerful when they connect several cells. If A equals B and B is different from C, then A must also be different from C. You can propagate that information even before you know whether A is a sun or a moon.

A simple method for your first games

1. Scan = and × clues first.
   Any clue next to a filled cell immediately determines its neighbour.
2. Search for touching pairs.
   Two matching suns or moons force the cells beside the pair to be the opposite symbol.
3. Search for sandwiches.
   Sun–empty–sun and moon–empty–moon each force the middle cell.
4. Count every nearly complete line.
   If one symbol has already reached three occurrences, fill the remaining spaces with the other.
5. Repeat the scan after every deduction.
   One new symbol can activate a relationship clue or create a new pair in another direction.

What to do when you get stuck

Change what you are looking for. Instead of staring at individual empty cells, scan all rows for completed counts, then all columns for pairs, and finally trace the = and × links. A fresh pass often reveals a constraint you ignored because your attention was fixed on one local area.

Before Tango: binary grid puzzles

In this puzzle family, every cell has only two states: black or white, 0 or 1, X or O, or any other contrasting pair. The characteristic rules are an equal number of each state in every row and column and a ban on three identical states in a row.

Simon Tatham's well-known puzzle collection documents a version called Unruly and attributes the puzzle type to Italian puzzle inventor Adolfo Zanellati, under the name Tohu wa Vohu. Around the same period, Belgian creators Peter De Schepper and Frank Coussement developed and registered the name Binairo. The historical record is therefore better described as a family with overlapping early forms than as a single perfectly documented invention story.

Is Tango simply Takuzu with different symbols?

They are clearly close relatives, but treating every rule set as identical can create mistakes. Traditional Takuzu/Binairo variants often include an additional rule stating that no two completed rows may be identical, and no two completed columns may be identical. LinkedIn's published Tango rules do not list that restriction.

Tango also makes the = and × relationship clues a central part of its presentation. Those clues turn neighbouring cells into explicit logical relationships, which gives the game a different rhythm even when the underlying balance and adjacency rules feel familiar.

The × sign is not multiplication

Despite its appearance, × has no mathematical operation attached to it. It simply means different: if one side is a sun, the other must be a moon, and vice versa. The = sign similarly means only same.

The symbols can change without changing the puzzle

LinkedIn's own help documentation notes that Tango may use different emojis on certain days. That works because the puzzle does not care whether its two states are suns and moons, cats and dogs, black and white, or 0 and 1. As long as there are two clearly distinguishable states, the logic survives intact.

It can be described as a constraint satisfaction problem

From a computer-science perspective, each cell is a binary variable. The grid then adds several kinds of constraints: exact balance in each row and column, forbidden runs of three, and equality or inequality relationships between selected neighbours. Solving the puzzle means propagating those constraints until each variable has only one valid value left.

Simple rules do not mean shallow reasoning

A beginner may solve one cell because two moons are already touching. A harder position can require following several = and × links, checking what each possibility would do to a row count, and noticing that one branch would force an illegal run elsewhere. The vocabulary stays small while the chains of reasoning grow.

Why the name “Tango” fits the design

LinkedIn's public description uses the phrase “harmonize the grid”. The name also suits the way the two symbols interact: every placement affects a partner, a neighbour or an entire line. It feels less like filling isolated boxes and more like keeping two opposing states in balance.